NLTK is a leading platform for building Python programs to work with human
language data. It provides easy-to-use interfaces to over 50 corpora and
lexical resources such as WordNet, along with a suite of text processing
libraries for classification, tokenization, stemming, tagging, parsing,
and semantic reasoning, and an active discussion forum.
Thanks to a hands-on guide introducing programming fundamentals alongside
topics in computational linguistics, NLTK is suitable for linguists,
engineers, students, educators, researchers, and industry users alike.
NLTK is available for Windows, Mac OS X, and Linux. Best of all, NLTK is
a free, open source, community-driven project.
NLTK has been called "a wonderful tool for teaching, and working in,
computational linguistics using Python" and "an amazing library to play
with natural language".
WWW: http://www.nltk.org/

Reason:
Nltk has been upgraded to 2.0b8 which depends on devel/py-yaml now.
You need to deinstall nltk before upgrading, since the previous port
will delete files installed from py-yaml during its deinstall phase.
Use, for example:
# pkg_delete nltk-2.0b7,1
# portsnap fetch update
# cd /usr/ports/textproc/nltk/
# make install clean

Number of commits found: 35

Commit History - (may be incomplete: see SVNWeb link above for full details)

- Remove the DESTDIR modifications from individual ports as we have a new,
fully chrooted DESTDIR, which does not need such any more.
Sponsored by: Google Summer of Code 2007
Approved by: portmgr (pav)